<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
		<style>
			.dad {
				width: 400px;
				height: 400px;
				background-color: pink;
			}

			.baby {
				width: 200px;
				height: 200px;
				background-color: purple;
			}
		</style>
	</head>

	<body>
		<div class="dad">
			<div class="baby"></div>
		</div>
		<script>
			const dad = document.querySelector(".dad");
			const baby = document.querySelector(".baby");
			dad.addEventListener("mouseover", function () {
				console.log("鼠标移入dad");
			});
			dad.addEventListener("mouseout", function () {
				console.log("鼠标移出dad");
			});

			baby.addEventListener("mouseover", function () {
				console.log("鼠标移入baby");
			});
			baby.addEventListener("mouseout", function () {
				console.log("鼠标移出baby");
			});
		</script>
	</body>
</html>
